Tools
Free developer tools and personal finance calculators, all running in your browser.
Developer
JSON Formatter
Paste any JSON and instantly get a clean, indented, syntax-highlighted view.
JSON / CSV Converter
Convert JSON arrays into CSV tables or turn CSV rows into JSON objects directly in your browser.
Color Picker
Pick a color or paste a code and instantly convert it to HEX, RGB, HSL, HWB, and CMYK.
JWT Decoder
Paste any JWT and instantly decode the header, payload, and claims — no server, no secrets sent anywhere.
HTML Preview
Paste HTML and render a sanitized live preview in a locked-down sandbox, entirely in your browser.
Markdown Preview
Paste any Markdown and see a live formatted preview — no account, runs entirely in your browser.
UUID Generator
Generate UUIDs for any version (v1–v8), copy them instantly, and keep a local history of past results.
Cron Expression Builder
Build 5-field cron schedules with presets, validation, and a plain-English explanation.
Finance
Compound Interest Calculator
See how your investments grow over time with regular contributions and compound interest.
Savings Goal Planner
Find out how much you need to save each month to reach any savings target.
FIRE Number Calculator
Estimate your target portfolio and how long it may take to reach financial independence.
VAT Calculator
Calculate VAT and withheld tax on any invoice amount — pick a preset rate or enter a custom one.
Freelance Hourly Rate Calculator
Find out what hourly rate to charge as a freelancer based on your income goal and working hours.